Removed django.db.models.options.Options.one_to_one_field.

The last use of it was removed in r9641 (it's internal API) and it's been
broken since r7477, as there's no longer a maximum of one OneToOneField per
model, so anything relying on it contained subtle bugs.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9643 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/related.py

@@ -728,8 +728,6 @@ class OneToOneField(ForeignKey):
     def contribute_to_related_class(self, cls, related):
         setattr(cls, related.get_accessor_name(),
                 SingleRelatedObjectDescriptor(related))
-        if not cls._meta.one_to_one_field:
-            cls._meta.one_to_one_field = self
 
     def formfield(self, **kwargs):
         if self.rel.parent_link:

django/db/models/options.py

@@ -41,7 +41,6 @@ class Options(object):
         self.meta = meta
         self.pk = None
         self.has_auto_field, self.auto_field = False, None
-        self.one_to_one_field = None
         self.abstract = False
         self.parents = SortedDict()
         self.duplicate_targets = {}